Pearce-Crump's Dirichlet reciprocal derivative moment conjecture

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Let χ\chi be a primitive Dirichlet character modulo q>1q>1, and let L(s,χ)L(s,\chi) be its Dirichlet LL-function, with non-trivial zeros ρ=12+iγ\rho=\tfrac12+i\gamma. Assume the Generalised Riemann Hypothesis for L(s,χ)L(s,\chi) and that all its non-trivial zeros are simple. Dirichlet reciprocal derivative moment conjecture. As T→∞T\to\infty,

∑0<γ≤T1∣L′(ρ,χ)∣2∼Aq2π T,\sum_{0<\gamma\le T}\frac{1}{|L'(\rho,\chi)|^2}\sim\frac{A_q}{2\pi}\,T,

and this asymptotic is expected to hold uniformly for q≤TAq\le T^A, for any fixed A>0A>0. Here AqA_q is the arithmetic factor defined in the paper. The paper proves a conductor-uniform lower bound capturing a proportion β/(1+β)\beta/(1+\beta) of the conjectured main term, but the full asymptotic is open.

References

Primary source

Andrew Pearce-Crump, “Negative discrete second moments of Dirichlet L-functions”, arXiv:2606.25094 (2026).

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